668375 has 8 divisors (see below), whose sum is σ = 834288. Its totient is φ = 534600.

The previous prime is 668347. The next prime is 668407. The reversal of 668375 is 573866.

It is a happy number.

It is not a de Polignac number, because 668375 - 2¹⁰ = 667351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2549 + ... + 2798.

It is an arithmetic number, because the mean of its divisors is an integer number (104286).

2⁶⁶⁸³⁷⁵ is an apocalyptic number.

668375 is a deficient number, since it is larger than the sum of its proper divisors (165913).

668375 is an equidigital number, since it uses as much as digits as its factorization.

668375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362 (or 5352 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 668375 is about 817.5420478483. The cubic root of 668375 is about 87.4326011591.

The spelling of 668375 in words is "six hundred sixty-eight thousand, three hundred seventy-five".